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J. B. SMITH, OF MlLlVAUKEE, WISCONSIN.

Lettere Patent No. 72,100, dated Deeember 10, 1867; enteci'ated December 6, 1867.

IMPROVEMENT IN MACHINES FOR SHARPENING SAWS.

T0 ALL WHOM IT MAY OONCERN:

Be it known thntl, 1B. SMITH, of the city end county et' Milwaukee, und State et' Wisconsin, have invented e new and useful Improvement for Sharpening und Setting Saws; and I do hereby deelnre that the following is a full, elettr, and exa-ot deseriptionthereof, which will enable those skilled in the nrt to make and use the same, reference being had to the accompanying drawings, forming pnrt of this specification, in which- Figure 1 is e perspective rien'.

Figure 2, top `rien', showing n sew in position to be sharpened.

Figure 3, end. View, with sew in the setting-Works.

Figure 4, setting-gauge, with one jew removed.

Figure 5, settingdevers.

Figure 6, longitudinal section oi' suiv-mnndrel.

Similar letters of reference, in each of the iigures, indicate corresponding parts.

The nature of my invention consists in machinery arranged to sharpen and set sans in the most perfect, und expeditious manner.

A is the frame; B, an emery-wheel on a, shaft, with pulley for giving it motion; C, carriage, on `which to ley the saw to be sharpened; D, adjustable mandrel or centre, to keep the saw steady', und on which to revolve it; E, adjustable gauge, to regulate the size und length of tooth; F, eene-mandrel, on which to secure the saw for setting it; G, gauge to regulate the set in the sew; H, compound lever, with which toset the saw-teeth; a a, adjustable jews to gauge G, to regulate and gauge the set of the sew-teeth; b, `cone-centre of mandrel F; e, spiral spring, to keep the cone-centre out; d, countersnnk nut; e, screw-bolt, over which slips eene-centre t, and on which nut c'Z screws, to hold the sew iirmly against the shoulder or collar on mandrel. Cone-centre b may be adjusted by lever, screw, or other ineens, :is well as by spring, so that it may fit the eye in any saw.

Operation: Put the sauf on mandrel F, then adjust setting-lever H and geuge G- tothe size of the saw; the jaws a a ,set apart just as far as thekerf the sow is designed to ent, and lever H set so that the outer settingpeints shall he neer the peint of the sew-teeth. Then, when fncing the saw, to set e. tooth to the right, move the handle of the setting-lever to the right; this will bring the left-hand outer setting-point against the point of the tooth, and the right-hand inner setting-point against the root of the tooth. This will set the tooth more or less, as desired. Then turn the sew on the mandrel till the set tooth comes to the gauge-jaws a a, and if set right., then set the next tooth to the left, :1nd so on alternately, till all are set, the gauge Gr being e perfeetguide by which to set every tooth toits proper position. Then take the saw from ninnzlrel F, and lay it on carriage C, Wit-h its eye oifer centre mandrel D, sniil'mn'ndrel D first being adjusted so that the teeth ofthe saw shell have the proper reke end length when operated on by the emerywrheel B, gauge E being set so as to give the requisite size of tooth after the lirst tooth is formed. Then, as the carriage is moved, the sew is brought in contact with the cutter B, the pin on gauge E coming between the teeth, es shown in fig. 2, and the cutting side of the toollnhetween seid pin and cutter B, is sharpened by coming in Contact with the lut side of seid cutter or wheel in motion. Then, es the ce1-ringe is drawn hack, grndunlly turn the sen', so that the heel: of the tooth just sharpened shall press against the gauge-pin; this will bring the back of the next tooth against the bevel side of the wheel B, which will form it exactly like the one pressing against seid guide-pin, nud so on, forming und sharpening tooth after tooth, till all nre completed. Then pnt the saw again on mandi-ell:1 and test its set; it :my teeth want reseting; the gauge G will shoiv it. The reason for setting the sew before sharpening, is, that the teeth be sharpened perfectly square across the sew, making the outer point or" eeeh tooth enough longer than the inner point to maire the tooth, when cutting, strike the Wood square, which would not be the ense it the tooth should be sharpened before setting. Centre mandrel D hes e eoneeentre, und is merle like mandrel F, with the exception that it has a square nut on the serew-l1olt, sznull enough for the eye nl' the sun' to pass over it, instead oi' the eonntersunl; nut n'. 6

What I claim as my invention, and desire to secure by Letters Piitont, is-

Cutter B, gauge E, `und adjustable conennnnflrel D, in combination, substantially es and for the purpose described.

J. B. SMITH.

Witnesses:

J. N. MASON,

Ones. A. Snrrn. 

